Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
08-11-2018, 08:07 AM   #1
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Astro Tracer Failure?

Last night I went out to try some astrotracing and I followed all the instructions before I went out to make sure it was working. So out in the dark outside of town the stars and planets were magnificent. I set the camera up on the tripod, turned it on, and clicked the shutter. The capture seems to begin but after a minute the GPS light went out and then I wait for the exposure time to elapse. Nothing happens. The camera is unresponsive. I turn it off and back on again and nothing. I thought maybe the battery died so I replaced it. Set it up again and same thing happens.

So my question is what should the K-1 be doing and what indications are there to tell if it's working? I know it's operator error and somehow I must have done something wrong.

08-11-2018, 08:22 AM   #2
Site Supporter
Site Supporter
FozzFoster's Avatar

Join Date: Jan 2016
Location: Alberta
Posts: 3,514
What mode, and drive are you in? Bulb mode set to Astrotracer, and 2 second timer?

Also, did you calibrate, then precision calibrate, at the site you wanted to take pictures at - as well as before you went out?

On my O-GPS1, there's a light light on the back the lets me know when it's working..

Last edited by FozzFoster; 08-11-2018 at 08:30 AM.
08-11-2018, 09:05 AM   #3
Pentaxian




Join Date: May 2016
Photos: Gallery
Posts: 1,449
Did you have long shutter noise reduction on by any chance? In the dark especially, I've forgotten that was happening and thought the camera was dead.
08-11-2018, 09:08 AM   #4
Loyal Site Supporter
Loyal Site Supporter




Join Date: Dec 2016
Location: Shelton, CT
Photos: Albums
Posts: 620
On my K-3 II it takes some time after the capture is complete to process the photo. It is possible that you just require a little patience for the process to complete. The longer the shutter speed the longer the processing.

08-11-2018, 09:32 AM   #5
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Thanks Fozz. I did did both the calibrations at home but not at the site. I'll try that too. I had it set to Bulb with the GPS on and had the AstroTracer symbol on the screen. The AF mode was set to MF. I'll play with it some more.
08-11-2018, 09:34 AM   #6
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Thanks for the info aaacb and steve. I'll try to be more patient.
08-11-2018, 09:37 AM   #7
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Okey dokey, I was more (im)patient and waited for awhile and lo and behold the camera came alive after processing. Now to try it at night again.
08-11-2018, 09:44 AM   #8
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Success!

08-11-2018, 10:05 AM   #9
Pentaxian




Join Date: May 2016
Photos: Gallery
Posts: 1,449
Great to hear it worked. Here's something I've read but have not done myself: Instead of letting the camera do the darkframe subtraction for you (which is what long shutter nr does), you could take one or more shots with the lens cap on and viewfinder covered, exposed for the same time as the actual photo, and use those instead in post. It may not be as accurate as letting the camera do it right after the actual photo because the sensor may be at different temperatures, but if you're taking series for stacking, you avoid doubling the overall time.
08-11-2018, 10:24 AM   #10
Forum Member




Join Date: Jan 2016
Photos: Gallery | Albums
Posts: 75
So, as others have mentioned, if you have long shutter noise reduction enabled (I think it is by default on my cameras, but I don't have the K-1) and you take a 20s exposure, after 20s, you should hear the shutter close, then the camera will be totally unresponsive for 20s longer, then, in my case with the KP, the activity light flashes as the image is recorded. I also see a progress bar on the display, in cases where I have something like clarity enhancement turned on.

I believe the benefit of doing the long shutter NR in camera is that it is able to look at what the noise on *your* sensor looks like after being active for 20s (for example), at the ambient temperature and internal camera temperature at the time and place where *you* are shooting. As far as whether or not this is "better" at NR than various post-processing tools, I don't have enough experience to say.

You could always try taking the same exposures with and without long shutter NR turned on and compare them to each other, and then to what you can do in post.

FWIW, I recently spend 90 minutes out at the lake on vacation doing some astrotracer shots and those extra 20 or 30s during the NR felt like an eternity while I was standing on tired legs, underdressed for the cold 😑
08-11-2018, 12:30 PM   #11
Forum Member




Join Date: Jul 2017
Posts: 99
I have the K-1. The Slow Shutter Speed NR is in capture menu 2 at the bottom. Like you, I get impatient. I turn off the NR when using Astrotracer and I think I still get decent shots.

During the noise reduction period, if you look in the upper left of the top LCD display, you will see the countdown of the time remaining and a blinking “nr” on the right. It is hard to see because the display does not light up, but it gives you confidence the camera is not dead. The counter also helps with that patience thing to prove time is actually moving... (The counter also runs during the exposure.)

---------- Post added 08-11-18 at 12:50 PM ----------

Update... just by accident, I discovered if you are in the Bulb mode with the countdown timer runnng, you DO NOT get the countdown timer in the top display.

This was a mode added during one of the firmware updates. It is intended for intentionally shooting star trails. In Manual exposure mode the longest exposure time is 30 seconds. Using the timer in bulb mode you can go up to 20 minutes, but the Astrotracer function stays off. The camera does appear dead in this case.

Getting the timer in bulb mode is a little tricky... You can get the timer by starting in bulb mode with Astrotracer on, pressing info and turning off Astrotracer on the info screen and exiting with the menu button.

So if you want Astrotracer, make sure the screen is showing the maximum exposure time below the ISO on the back of the camera in bulb mode. If not, turn on Astrotracer on the info screen. If you don’t get a count down on the top, you are not in Astrotracer mode.
08-11-2018, 02:11 PM   #12
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Thanks for the input!
08-11-2018, 02:21 PM   #13
Pentaxian
MJKoski's Avatar

Join Date: Aug 2016
Posts: 1,330
Sony 36MP sensor camera bodies do not usually need long exposure noise reduction when time is 30 second or less. In extreme heat I would use it (+30C or more). When using astrotracer for longer than that, it is somewhat useful.
08-11-2018, 03:13 PM   #14
Loyal Site Supporter
Loyal Site Supporter




Join Date: Jun 2009
Location: Tumbleweed, Arizona
Photos: Gallery | Albums
Posts: 5,412
QuoteOriginally posted by MJKoski Quote
Sony 36MP sensor camera bodies do not usually need long exposure noise reduction when time is 30 second or less. In extreme heat I would use it (+30C or more). When using astrotracer for longer than that, it is somewhat useful.
I like your humor - +30C isn't extreme at all, especially here in the southwest sonoran desert - even at night, especially during the summer. That said, I've starting to use LENR on the foreground landscape shots, but my astro/star shots have been pretty clean.

I'm also considering taking a single dark frame at the end of the shoot and then using that to process all the previous foreground shots. I'm usually shooting 50 to 60 second sky and foreground exposures, although for some darker locations (Kofa*, would probably need longer foreground exposures).
*Kofa - Kofa (King of Arizona mine) National Wildlife Refuge, has supposedly been measured to be the second darkest location in the continental US.
08-11-2018, 07:24 PM   #15
Site Supporter
Site Supporter
wtlwdwgn's Avatar

Join Date: Jan 2007
Location: Billings, MT
Photos: Gallery | Albums
Posts: 11,444
Original Poster
Thanks for your input!
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
astro tracer, bulb, camera, display, dslr, exposure, full frame, full-frame, info, k-1, k1, pentax k-1, screen, time
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
The dreaded SDM failure topic - Nikon AF motor failure perspective beholder3 Pentax SLR Lens Discussion 21 07-19-2018 10:02 PM
Astro Photography ~ Need Advice and Criticism Roism Pentax K-5 19 02-25-2017 08:47 PM
Hoping to find Astro-nuts and Solar Eclipse veterans KrisRae Welcomes and Introductions 21 02-17-2017 11:20 AM
Astro tracer and wifi question. Gimbal Pentax K-1 6 05-19-2016 10:18 AM
Astro Tracer (OGPS1) question LukeOB Photographic Technique 4 01-13-2013 05:30 PM



All times are GMT -7. The time now is 12:37 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top